Fertilisers & Additives

Houseplant fertilisers include liquid feeds, powder formulas, organic products and specialist nutrients for soil, coco, hydro and semi-hydro growing. CalMag, rooting, microbial, enzyme, silicon and pH products address specific nutrient, root and water-quality needs alongside complete plant nutrition.

Quick buying checks:

Purpose: Fertilizers replace nutrients that plants use, lose through watering or no longer get from ageing substrate.
Starting dose: For complete liquid feeds indoors, 25–50% of the label dose is often a safer first step.
Best timing: Feed when plants are producing active root or leaf growth, not when growth has clearly slowed.
Application: Apply liquid feeds to evenly moist substrate unless the product label says otherwise.
Semi-hydro: Inert media add no nutrition, so nutrients need to come from the water or reservoir routine.

Easy plant foodSimple feeding for indoor plants in regular potting mix.

Organic feedingOrganic liquid feeds and soil-friendly plant support.

Semi-hydro & LECAMineral nutrients for inert media, reservoirs and LECA-style setups.

Coco nutrientsA+B feeds and support products for coco-grown houseplants.

Rooting & recoveryRoot stimulators, rooting aids and repotting support.

pH, CalMag & waterWater correction, mineral balance and pH adjustment tools.

Additives & enzymesEnzymes, silicon, vitamins and targeted plant-support products.

Biobizz Acti Vera

From €8,00

Biobizz Alg A Mic

From €6,25

Biobizz Bio Grow

From €4,00

Biobizz Bio Heaven

From €20,75

Biobizz Calmag

From €5,50

Biobizz Fish Mix

From €3,75

Biobizz Microbes

€67,75

Biobizz Root Juice

From €14,25

BIOCANNA Bio Rhizotonic

From €15,25

BIOCANNA Bio Vega

From €14,25

Organic Plant Food – 50ml main product photo on white background.

Botanopia Complete Organic Plant Food

€10,75

CANNA Aqua Vega A+B

From €17,00

CANNA CalMag Agent

From €14,25

CANNA Cannazym

From €9,00

CANNA Coco A+B

From €15,50

CANNA Hydro Vega A+B

From €18,25

CANNA pH Plus 5%

€9,75

CANNA pH- Growth 17% Pro

€9,25

CANNA Rhizotonic

From €16,00

CANNA Start

From €11,75

CANNA Terra Vega

From €12,00

HESI Bio Grow

From €12,00

HESI CalMag

From €7,25

HESI Coco

From €11,75

HESI Hesilicio

From €6,00

HESI HousePlant Elixir

From €11,50

HESI Hydro Growth

From €11,25

HESI OrchiVit

From €9,50

HESI PowerZyme

From €10,75

HESI Root Complex

From €19,25

HESI SuperVit

From €11,75

HESI TNT Complex

From €10,75

Plagron Alga Grow

From €7,75

Plagron CalMag Pro

From €12,00

Plagron Cocos A+B

From €15,25

Plagron Hydro A+B

From €16,50

Plagron Hydro Roots

From €6,50

Plagron Lemon Kick

From €10,50

Plagron NextGen Rooting Gel

€9,50

Plagron pH Min

From €11,50

Plagron pH Plus

From €8,75

Plagron Power Roots

From €20,75

Plagron Pure Zym

From €11,00

Plagron Seedbooster Plus

€21,00

Plagron Silic Rock

From €8,50

Plagron Terra Grow

From €10,75

Plagron Vita Race

From €10,75

Pokon Bio Plant Cure Capsules

€10,75

Person pouring liquid fertilizer from a brown bottle into a watering can on a wooden table with plants and gardening tools.

Choosing fertiliser by growing system

Houseplant fertilisers differ in nutrient balance, concentration, delivery method and growing-system compatibility. Liquid feeds suit flexible dosing, slow-release products provide gradual nutrition and specialist formulas support orchids, aroids or mineral systems. The right choice starts with the medium and the plant’s active growth.

Concentration and dosing style

Highly concentrated products offer many applications from a small bottle and require precise measuring. Ready-to-use or lightly concentrated feeds simplify routine care. Clear dosing instructions, bottle size and application frequency help compare value across products.

Plants in active growth use nutrients steadily, while slow seasonal growth calls for a lighter schedule. Nutrient balance, dilution and timing determine effective houseplant fertilising.

Soil and mineral growing systems

Organic-rich mixes hold and release nutrients differently from pumice, pon or expanded clay. Semi-hydro setups benefit from formulas designed for mineral media and regular reservoir care. Fertilising in semi-hydro focuses on concentration, flushing and steady supply.

Bottle format also matters in regular use. Measuring caps, pumps and clear labels make repeat dosing easier. A product that matches the growing system supports a consistent routine across the plants that use it. The repotting guide helps coordinate feeding changes with fresh substrate and renewed root growth.

Frequently Asked Questions About Fertilizers

Which fertilizer should I choose for my houseplants?

Start with the growing method. For plants in regular potting mix, a complete houseplant fertilizer or organic plant food is usually the easiest choice. For coco, LECA or semi-hydro, choose a feed made for that setup, because the substrate affects how nutrients and water behave around the roots.

Can I use regular plant food in LECA or semi-hydro?

For LECA, pon and other inert semi-hydro setups, a hydro or semi-hydro nutrient is usually the cleaner choice. Inert media do not add nutrition on their own, so the feed has to supply the plant through the water or reservoir. Some simple products can work for light use, but pH, EC and mineral balance matter more than in soil.

What is the difference between fertilizer and additives?

A complete fertilizer provides the main nutrients a plant uses for growth. Additives have narrower jobs, such as root support, enzyme activity, silicon, CalMag or pH correction. They can be helpful in the right setup, but most additives are not meant to replace a suitable base feed.

How often should I fertilize indoor plants?

Feed when the plant is actively producing roots or leaves and the growing conditions can support that growth. Indoors, starting below the full label dose is often safer, especially for small pots, lower light or sensitive plants. Increase only when new growth looks steady and the substrate drains properly.

Should I fertilize a stressed or struggling plant?

No. Fix the real problem first, whether that is poor light, root trouble, temperature stress, pest pressure, or bad watering. Fertilizer supports growth; it does not rescue a plant that is already in trouble.

Worth reading:

Close-up of hands measuring liquid houseplant fertilizer

Which Fertilizer Works Best for Your Houseplants?

Hands fertilizing indoor plants with bottles, tools and containers on a table

Beginner’s Guide to Fertilizing Houseplants

Epipremnum aureum cutting, LECA, self-watering pot, water indicator and fertilizer bottle

How to Fertilise Houseplants in Semi-Hydro: LECA, Pon and Mineral Mixes

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